Glasses material type
glass glasses
It is by far the most used material, although the trend is to be replaced in the near future as it is the most expensive, heaviest and prone to deterioration. However, glasses with the highest optical quality are made from this material.
plastic resin glasses
While they usually cost the same as crystal, their main advantage is their light weight, although they are somewhat thicker than crystal.
high refractive index plastic
They make up a new generation of lenses that are thinner and lighter; so they are ideal for high school graduates. They allow the addition of filters to protect them from UV rays and increase their resistance to scratches or breakage. The main disadvantage of this material is its price, as it is usually more expensive.
polycarbonate plastic
They are the most durable and lightest; therefore, they are suitable for children and athletes. They also allow systems incorporating UV filters, antireflection and increasing their resistance to breakage.
Glasses filter type
Filters to prevent abrasion
One of the major concerns for eyeglass wearers is lens wear. Leaving them on a table, washing them with unsuitable materials, etc., accelerates the deterioration of the lenses; this leads to vision problems and assumes the need to replace the lenses at a corresponding economic cost. Currently, there are very effective filters available to prevent eyeglasses from scratching or deteriorating. However, it is important for eyeglass wearers to understand the care required for the type of lenses they use, and this information can be obtained from their trusted optometrist.
UV filter
UV radiation contains ingredients that are harmful to eye health. For this reason, it is necessary to use protective filters, especially in individuals with macular degeneration. Currently, the most widely used lenses are polycarbonate and high-index plastics, which already incorporate these filters. Therefore, it is advisable to ensure that there are no additional surcharges for these filters in the price of the lenses.
Anti-reflection filter
There are a variety of conditions that can cause reflections in the lens: certain sidewalks, water, snow, glass, etc. This situation can cause a different type of problem, a loss of visual quality, which is especially important when we are driving, and even more so if it is at night. To avoid this unpleasant side effect, there are filters that cover the lenses to reduce these reflections. Filter users should be aware that cleaning the lenses with abrasive materials can damage the filters; therefore, it is necessary to use a damp cloth or simply run the glasses under the tap and apply some soap to them, then allow them to dry without touching the lenses.
glasses with special filters
Filters have recently appeared to improve special cases, mainly to increase contrast in patients with macular changes, an increasingly frequent procedure as it is related to age.
Longer life expectancy means a significant increase in the incidence of these eye diseases. In these cases, filters that pass only part of the spectrum can be used. In general, they are yellow and what they achieve is to block the passage of blue light (chromatic aberration), a condition that leads to a more serious deterioration of the visual quality.
It is common for people to use glasses with yellow lenses to improve contrast and visual quality, and while we have said they are suitable for people with macular degeneration, they are also very useful for people with any type of retina that involves a gradual loss of visual function. process. These filters are also used by individuals who must drive or perform activities that require prolonged staring. In these cases, no ailment of any kind is required, they may be beneficial as they improve visual conditions by causing a certain relaxing effect. As we noted, this type of filter has proven useful for people with dyslexia, as it helps to fix the focus of the letters.
